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The stepwise accuracy-improvement strategy based on the Kriging model for structural reliability analysis

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Abstract

For structural reliability analysis with time-consuming performance functions, an innovative design of experiment (DoE) strategy of the Kriging model is proposed, which is named as the stepwise accuracy-improvement strategy. The epistemic randomness of the performance value at any point provided by the Kriging model is used to derive an accuracy measure of the Kriging model. The basic idea of the proposed strategy is to enhance the accuracy of the Kriging model with the best next point that has the largest improvement with regard to the accuracy measure. An optimization problem is developed to define the best next point. The objective function is the expectation that quantifies how much an untried point could enhance the accuracy of the Kriging model. Markov chain Monte Carlo sampling and Gauss–Hermite quadrature are employed to make several approximations to solve the optimization problem and get the best next point. A structural reliability analysis method is also constructed based on the proposed strategy and the accuracy measure employed. Several examples are studied. The results validate the advantages of the proposed DoE strategy.

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Authors and Affiliations

  1. Northeastern University, Shenyang, China

    Jian Wang & Zhili Sun

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  1. Jian Wang
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  2. Zhili Sun
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Correspondence to Jian Wang.

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Wang, J., Sun, Z. The stepwise accuracy-improvement strategy based on the Kriging model for structural reliability analysis. Struct Multidisc Optim 58, 595–612 (2018). https://doi.org/10.1007/s00158-018-1911-9

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  • DOI: https://doi.org/10.1007/s00158-018-1911-9

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